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What is the relationship between evaporator air flow and suction superheat?
Dawnvicm
air flow and liquid change of state
Wiki User
∙ 13y ago
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What is suction and discharge superheat?
Suction superheat is the heat added to the refrigerant above that required to change its state from liquid to vapour (as happens in the evaporator). This heat is added both in the evaporator, in the suction line and (where applicable) in the suction accumulator.Discharge superheat is suction superheat plus heat of compression, and must be removed in the condenser before condensation, the change of state from vapour to liquid, can occur.The HVAC Veteran
Effect of moisture on thermostatic expansion valve?
None, a TXV operates by it's sensing bulb sensing superheat of the suction line as it exits the evaporator coil.
How do you calculate superheat temp?
take your gages and put them on the beginning of the evaporator (afte metering device or txv) and look at saturation temp then get your temp at the suction line (before the compressor)
How do you mesure superheat?
Superheat is measured by calculating the temperature of the refrigerant vapor above its saturation temperature at a given pressure. This is done using a pressure-temperature chart for the specific refrigerant being used. The difference between the actual vapor temperature and the saturation temperature at that pressure is the superheat.
What is the fan speed relationship to suction pressure?
for a given air conditioner: the faster the condenser (outdoor) fan the lower the suction pressure. the faster the evaporator (indoor) fan the higher the suction pressure.
What is the superheat if the suction pressure is 60 psig and the suction line temperature is 40 degrees?
-5 something is wrong
Where is low pressure AC port?
It will be on the suction line (larger of the lines) between the compressor and the evaporator.
Why is your suction line warm?
your starving the evaporator
What is the purpose of the external equalizer on a TXV?
The purpose of the External equalizer on the TXV is to compensate for the pressure drop in the evaporator coil , This is done since the superheat calculation is based on the difference in the Saturation temperature corresponding to the Suction pressure (Measured after the coil) and the actual suction line temperature. Now, in a TXV measurement of actual line temperature is accomplished by using the Sensing Bulb and the Measurement of the Suction pressure by the External Equalizer of the TXV. The opening/Closing of the Expansion valve is controlled by the setting of the superheat which is governed by the setting of the Spring.
What is a suction line on an Air Conditioner?
The suction line connects the evaporator outlet and the compressor intlet. Low pressure refrigerator vapour is drawn from the evaporator to the compressor through this line.
Where is the bulb of the TXV mounted on?
end of the evaporator on the suction line
Equalizing lines should be located in multiple condenser and compressor applications where Between condenser and evaporator coils or Near the TXV or Between compressors and condensers or None of them?
oppisite side of txv sensing bulb on outlet of evaporator (suction line)
